All of our Sensored brushless motors and their components are designed and produced by Rules of IFMAR World Championship. High quality NdFeB magnet used to sustain high temperature. Silicon Steel Sheets used have high permeability, but low in iron loss Recorded 92% high efficiency in certain models. Every single Savox brushless motor is dynamic balanced during production, thus vibration and noise is minimized to extend operating life time. Replaceable rotor design provides easy and simple DIY work for professional players. One-piece CNC case design to enhance the durability and hardness at the same time avoiding fall-offs of front and end bells during the runs.